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Dec. 1, 1925. 1.563.529

H. s. SATTERLEE FLEXIBLE CORE FOR MOLDING Filed July 17, 1924 INVENTORATTORNEY Patented Dec. 1, 1925.

UNITED Ell HENRY S. SA'ITERIJEE, 0F "EZ'UEK. N. Y.

FLEXKBLTE CllRE F013, lilIOLlI llh Application filed July 17, 1.924.

To all whom may concern:

.lle it known that l HENRY El. file'r'reenne, a citizen of the United.States enclaresident of i iew Yflli'i; city, county and State of llewYork, have invented en lrnpreveinent lflexihle {Jere/s fer Molding, oil?which the hillewinn is: a. specification.

lily invention relates to eel-es used in the preeesa ef molding and hasto do specifically Wl h flexible cores for the meldin of epirel er eurill cavities in one iieee 01' single hleeh' eestin lf rel/life]: the lerniatien a eurved or Spill ll ea ii a resting; has neveesitated urh(ltlfil'lllfl hein i; made in, tire er more parts and then ass-ienihled.lf a-rtieularly in ll it; rain of nun-metallic euhstanees the prehahililiee eff unmxan surfaces and inaecurate Wall jeintm-es are greatlyinw'eaeed in a llllllldlllll'll casting.

'lhe nee of my eere insa: es Gllflllilfih perfect in lei'ui and eurfaeeand at it great reihiel'ien in wet and. simplicity e15 prmluetiezi.

Elly invention may heet he un(lers-:leed. h lU'lllT'Bl'ililto thefellewing speeilieelien and the rli'awiiurs which lei-in pert of it.

ere l ia a plan View hf a (wire for illljj" a egl arithmie spiralrarity. lrilrjure shewe the eere plarwl in a, meld ar z'l'am i: rations.

wines, l lS the eere prepvr inerh el a re er resilient material, er(cemprmralm su-eh as rubber, grelatine er "the li e and Whieh ean heinitially formed in it 'l'lui 7 er plastie state.

At 2 is a, traetien lneinber prefera iiy elf hrziided rope havingr athandle or grip k) at its; free end. This traction meinliier may hare auniform diameter threugheut its length and lii'iiietien well, but I prrthis; to have rg'radually diminishing diameter sn'ialler end elf thespiral as iii the drawing.

along: and fixed to the rope is l, which eerrespend iu uuinhei' andsparing: in the 1 artieuler "type and :size oil? were in which they areapplied. 'lhese lins are nns-lierahly' inede of a light metal and attheir euter ends are Wire am jeining; thu outer ends With the menu-elleruieqh ntly these fine 41: are held he 'that they slant in thedirection of the pull that Serial No 72'6 502.

handle 25. The ailment elf this 1 results l find to he when theilllli'lefl with their radius renters i of from 10' to 30 it lied of theeere deereaees tewarrl the small end (if the spiral, the lies, alsodeereztse until, toward the very end they may he replaced by lznets inthe rope etraetien uzeinl'ier. liiueh lrnete are shown at lll will henoted that these time -'iletermine the pwfsllllfil'l ef the repe and itshugetien sueh ES to hi the fins el relatively hear the r iindary iii the(ere The his (3 en the lewer side ef the repe and harm" :lse slant inthe same i The degree if slant (if then fin need not he the smile a thatelf the l her lH it iieerissar that they ihrm the same angle with theirrespective radius i'eetera.

Figure F2 illuatrates my eere l plaeed in a l'ltfll li i) readr ferpouring. 'l he hedy of the treniitr el' the core may he supper ed. a. atll) h .iilll'filJiO means sueh as a rlaiaip (not ehewn.

fill the z-imall ewl reinity oi the huru l, shew a melallie piece llwhieln in this iustenve is El helhiiv i-iteiu flI Ul' the applieatienhi" :1, repreduein er lend speaking unit.

This stem its eleeely ever the f ll Mill end elf the spiral eere l. andis held there h v' passing the Mill ef rope fihreugh Sllll 11 andbinding it there by means such as pin The stem ll passing through the'lhialt l) fern s a sup iort for the small end U' the eere l.

ll? se deeiredythe larger end of the core l nay he supported by atapered. pin l whieh passes through the flash 9 inte the rere l asshown.

From the lfllGgl'Oll it is clear that my rear may he el such a form ofspiral or eui've that it may he all in one plane er it may he in severalplanes. l: are net liu'iil'ed heyond the elasticity of the corematerial.

The operation of my invention is follows:

The core 1 is greased or covered with lubricant and pieced in the flaskas described and shown in Figure 2.

(ill

The material to form the casting such as a gypsum cement, coverite orother substance, is poured in the tlaslt or otherwise molded about thecore and allowed to set. lVhatever taper pins were used to support thecore are then withdrawn and the open.- ings left by them are tilled withthe casting material. if chaplets are used for support these areplt'VlOllHlY made of the casting material and are left embedded in thecasting when the core is \vitlnlravvu.

If a stem such as il ii Figure 2 is used, the pin 12 is withdrawn at thetime the other pins or chaplets are talfen out so that the core and stemwi l separate upon withdrawal of the Eormer.

The main core l is now rrady to be removed. This is done by exerting amoderate tension in the handle 3 to overcome the initial resistance ofthe core after Which it can be pulled out without etiort, leaving aperfectly smooth, awurately formed cavity. Also Where the stem ll isused, the passage of that stem will register perfectly with the spiralcavitv to form a continuous and smooth pasage, and the stem vrill beheld solidly in the casting after the core is moved.

The method of removing the flexible core l involves certain factorswhich are found only in my invention.

The art of traction upon the handle 3 is transmitted through the member2 and the stays 5 and 8 to the tins :l: and (b and distribute thetraction ell'ort throughout the length of the core. 'lhese lins,particularly those at -il-, exert a tangential pull upon the core. This,combined with the elastic properties of the core substance, operates tolirst free the outer surface of the core from the casting and to pullthe core slightly forward and permit the dislodginent of the innerborder. This first small movement not only frees the core from thecasting but permits the gradual entrance of air between the surfaces sothat there is no vacuum adherenoe.

The core once started, is Withdrawn Without effort; the flexibility ofits material permitting it to pass the curves in the casting withouttrouble and leaving a smooth, uniform passage.

In being removed from the casting, the core naturally undergoes acertain amount of distortion of its curves. Nevertheless, I have foundthat, when properly constructed, a core of this nature may be used anindefinite number of times for it resumes its original shape in allrespects and suffers no permanent set from use.

\Vhile I have preferred to explain my invention by reference to theformat-ion of cavities of a spiral form, it is clear that I may make anyform of curved cavity and the amount of draught allotted to the coreneed be no greater than is customarily used in the art of molding.

Therefore I desire to include in my claims the full breadth of myinvention.

I claim:

1. A flexible core having a curved body, a traction member therein and aplurality of transverse elements disposal along and fixed to saidtraction member.

2. A flexible core having a rrr-l bedv. a traction member therein. 2transverse elements disposed a to said tra tion member, and stav membersconnecting the transverse lemenl':-: with the traction member.

o. A flexible core havin. curred body, the cross sectional area or whichgradually decreases from one end toward the other, a traction member insaid body and extending the full length thereof, a plurality of finsdisposed along said traction member and held at a predetermiiwd anglethereto bv stay members. I

l. Jr flexible core haying of spiral foru'i, a traction said body so poitioned as to be relativelv closer to the outer border oi said spiralbodi than it is to the inner border. traction ditributing elementsdisposed along and. fixed to said traction member and locatedtransversely thereof, said. traction distributing elements being bent ata predetermined angle in the direction of traction and held thereto bystay members extending between the traction distributii'ig elements andthe traction member.

5. A flexible core having a curved body, a traction member thereinhaving transverse elements disposed along and fixed to said tractionmember in such numbers and of such dimensions as to distribute thetraction ctl'ort throughout the length of said core.

(3. lhe method of molding curved cavities which comprises pouringcasting material around a solid flexible core of the curvature desired,and finally -withdrawirig said core from. the casting material.

7. The method of molding curved cavities which comprises pouring castingmaterial around a solid flexible core of the curvature desired, thenfreeing said core from its ini tial position to permit air to enter thecasting and finally Withdrawing the core.

8. lhe method of molding curved cavities which comprises pouring castingmaterial around a flexible core, then freeing the core from its initialposition by tangential force exerted upon the core, and finallyWithdrawing the core.

In testimony whereof, I have signed my name to this specification this12th day of July.

a tapered body member Within HENRY S. SATTERLEE.

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